15420473774 has 4 divisors (see below), whose sum is σ = 23130710664. Its totient is φ = 7710236886.

The previous prime is 15420473773. The next prime is 15420473779. The reversal of 15420473774 is 47737402451.

15420473774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×15420473774² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420473773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3855118442 + ... + 3855118445.

It is an arithmetic number, because the mean of its divisors is an integer number (5782677666).

Almost surely, 2^15420473774 is an apocalyptic number.

15420473774 is a deficient number, since it is larger than the sum of its proper divisors (7710236890).

15420473774 is an equidigital number, since it uses as much as digits as its factorization.

15420473774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7710236889.

The product of its (nonzero) digits is 658560, while the sum is 44.

The spelling of 15420473774 in words is "fifteen billion, four hundred twenty million, four hundred seventy-three thousand, seven hundred seventy-four".